US4413705A - Exhaust muffler for a two-cycle opposed cylinder engine - Google Patents
Exhaust muffler for a two-cycle opposed cylinder engine Download PDFInfo
- Publication number
- US4413705A US4413705A US06/326,774 US32677481A US4413705A US 4413705 A US4413705 A US 4413705A US 32677481 A US32677481 A US 32677481A US 4413705 A US4413705 A US 4413705A
- Authority
- US
- United States
- Prior art keywords
- exhaust
- cylinders
- diffusion chamber
- muffler
- exhaust ports
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B17/00—Chain saws; Equipment therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/001—Gas flow channels or gas chambers being at least partly formed in the structural parts of the engine or machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
- F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/1808—Number of cylinders two
Definitions
- the present invention relates to an exhaust muffler suitable for use in a two-cycle opposed cylinder engine of simultaneous ignition type having two cylinders opposing to each other in horizontal direction.
- the present inventor has already proposed a muffler for single cylinder engines, in Japanese Patent Publication No. 47214/1980.
- the present invention is to improve this muffler to make it adaptable to dual cylinder engines. According to the invention, it is possible to reduce the noise emitted from the engine by making the pressure waves of the exhaust gases from both cylinders interfere with each other in a diffusion chamber of the muffler, while increasing the output of each cylinder.
- an object of the invention is to provide a muffler for a two-cycle opposed cylinder engine of simultaneous ignition type having two cylinders opposing to each other in horizontal direction in which exhaust ports of two cylinders are arranged in a side-by-side relation and are connected to conical annular discharge passages having different opening areas.
- the exhaust gases from the both cylinders are discharged through these conical annular chambers into a common diffusion chamber so that the attenuation of the pressure waves and the reduction of the temperature of the exhaust gas are facilitated to lower the level of the exhaust gas noise.
- Another object of the invention is to provide a muffler for dual cylinder engine having a diffusion chamber divided into a first diffusion chamber and a second diffusion chamber which are communicated with each other through an interference chamber and an aperture formed in a partition wall.
- FIGURE is a sectional view of an essential part of a chain saw having an engine incorporating a muffler in accordance with the invention.
- a preferred embodiment of the invention will be described hereinunder with reference to the attached FIGURE.
- This embodiment is applied to an internal combustion engine mounted on a chain saw.
- the engine is a two-cycle opposed cylinder internal combustion engine having two cylinders arranged to oppose to each other in the horizontal direction, the ignition taking place in both cylinders simultaneously.
- the chain saw has a centrifugal clutch device connected to one side of the engine, through which a saw chain is slidingly driven along a saw bar attached to the body to the chain saw.
- a carburetor, a fuel tank and so forth are arranged above these cylinders, while an oil tank is disposed at one side of these cylinders.
- a common muffler 1 is disposed in a comparatively large space defined beneath the cylinders.
- the chain saw is carried and handled by means of a front and rear handles connected to the front and rear sides of the body thereof. As is well known, the chain saw has to undergo severe regulations for limiting the vibration and noise levels.
- the common muffler 1 is composed of two diffusion chambers A and B.
- the exhaust gas is discharged to the outside of the engine through the first chamber A, second chamber B and an exhaust pipe 9.
- the cylinders have exhaust ports 2, 3 arranged in side-by-side relation at one side of the common muffler 1. These exhaust ports 2, 3 are connected to the first diffusion chamber A.
- a member 5 having a form resembling an umbrella.
- a conical member 6 is disposed at the inner side of the umbrella-like member 5 to oppose to the latter thereby to form a conical annular discharge passage 7 therebetween.
- the conical annular passage 7 has a flat peripheral outlet 8 at the skirt portions of the members 5 and 6, so that the exhaust gas discharged from the exhaust port 2, 3 in the form of a column is changed into a flat disc-like form as the gas passes through the flat peripheral outlet 8 of the discharge passage 7.
- the area of the flat peripheral outlet 8 of the discharge passage 7 connected to the exhaust port 2 is different from that of the flat peripheral outlet 8 of the discharge passage 7 connected to the exhaust port 3.
- the exhaust gases from two cylinders, having different waveforms of the pressure wave are introduced into the common first diffusion chamber A and is led to the second diffusion chamber B through an interference chamber 10 formed at a substantially central portion of the first diffusion chamber A and then through apertures 12, 13 formed in the first diffusion chamber A and a partition wall 11 by which the first and second diffusion chambers A, B are separated from each other.
- the partition wall 11 may be integral with the conical members 6, 6 as illustrated or may be formed as a separate body from the conical members 6, 6.
- the provision of the interference member 10 is not essential. Namely, the interference chamber 10 may be omitted depending on the piston displacement of the engine. Also, the interference chamber 10 may be located at an offset from the illustrated central position.
Abstract
Description
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55-185649[U] | 1980-12-25 | ||
JP1980185649U JPS6012885Y2 (en) | 1980-12-25 | 1980-12-25 | Exhaust muffler for multiple cylinder engines |
Publications (1)
Publication Number | Publication Date |
---|---|
US4413705A true US4413705A (en) | 1983-11-08 |
Family
ID=16174456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/326,774 Expired - Fee Related US4413705A (en) | 1980-12-25 | 1981-12-02 | Exhaust muffler for a two-cycle opposed cylinder engine |
Country Status (4)
Country | Link |
---|---|
US (1) | US4413705A (en) |
JP (1) | JPS6012885Y2 (en) |
DE (1) | DE3151130C2 (en) |
SE (1) | SE453415B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4482028A (en) * | 1982-05-25 | 1984-11-13 | Kioritz Corporation | Muffler for internal combustion engine |
US4873766A (en) * | 1988-04-25 | 1989-10-17 | Johnston Robert H | Power saw |
US5199389A (en) * | 1991-06-21 | 1993-04-06 | Andreas Stihl | Work apparatus having an air-cooled internal combustion engine |
US6279519B1 (en) | 2001-02-15 | 2001-08-28 | William S. Nagel | Air and water cooled opposed cylinder aircraft engine |
US6415747B1 (en) * | 1998-06-19 | 2002-07-09 | Yamaha Hatsudoki Kabushiki Kaisha | Two stroke, multiple cylinder engine for small vehicle |
US6571910B2 (en) | 2000-12-20 | 2003-06-03 | Quiet Storm, Llc | Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler |
US20040200665A1 (en) * | 2003-04-08 | 2004-10-14 | Adams Gar M | Exhaust system for V-twin engines |
US20070034175A1 (en) * | 2004-01-02 | 2007-02-15 | Higgins Darrell G | Slide body internal combustion engine |
US20090000130A1 (en) * | 2006-01-13 | 2009-01-01 | Husqvarn Zenoah Co., Ltd. | Chain Saw |
US20090007438A1 (en) * | 2006-01-13 | 2009-01-08 | Husqvarna Zenoah Co., Ltd. | Chain Saw |
US20100083511A1 (en) * | 2008-10-06 | 2010-04-08 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US20100083512A1 (en) * | 2008-10-06 | 2010-04-08 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US20100154226A1 (en) * | 2008-12-19 | 2010-06-24 | Andreas Stihl Ag & Co. Kg | Hedge Trimmer |
US20110017336A1 (en) * | 2009-07-23 | 2011-01-27 | Briggs & Stratton Corporation | Muffler attachment system |
CN113503201A (en) * | 2021-07-23 | 2021-10-15 | 浙江派尼尔科技股份有限公司 | Double-cylinder opposed engine silencer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0303643B1 (en) * | 1987-02-20 | 1992-07-15 | GRAFF, Dirk | Drive system, in particular for a small vehicle |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3650354A (en) * | 1971-04-12 | 1972-03-21 | Briggs & Stratton Corp | Muffler for internal combustion engines |
US4178685A (en) * | 1977-07-29 | 1979-12-18 | Kioritz Corporation | Chain saw |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5247214A (en) | 1975-10-14 | 1977-04-14 | Kenesu Kuraudaa Uirii | Air cushion type surface vessel |
JPS5444140A (en) * | 1977-09-14 | 1979-04-07 | Kyoritsu Kk | Engine muffler |
-
1980
- 1980-12-25 JP JP1980185649U patent/JPS6012885Y2/en not_active Expired
-
1981
- 1981-12-01 SE SE8107158A patent/SE453415B/en not_active IP Right Cessation
- 1981-12-02 US US06/326,774 patent/US4413705A/en not_active Expired - Fee Related
- 1981-12-23 DE DE3151130A patent/DE3151130C2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3650354A (en) * | 1971-04-12 | 1972-03-21 | Briggs & Stratton Corp | Muffler for internal combustion engines |
US4178685A (en) * | 1977-07-29 | 1979-12-18 | Kioritz Corporation | Chain saw |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4482028A (en) * | 1982-05-25 | 1984-11-13 | Kioritz Corporation | Muffler for internal combustion engine |
US4873766A (en) * | 1988-04-25 | 1989-10-17 | Johnston Robert H | Power saw |
US5199389A (en) * | 1991-06-21 | 1993-04-06 | Andreas Stihl | Work apparatus having an air-cooled internal combustion engine |
US6415747B1 (en) * | 1998-06-19 | 2002-07-09 | Yamaha Hatsudoki Kabushiki Kaisha | Two stroke, multiple cylinder engine for small vehicle |
US6571910B2 (en) | 2000-12-20 | 2003-06-03 | Quiet Storm, Llc | Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler |
US6279519B1 (en) | 2001-02-15 | 2001-08-28 | William S. Nagel | Air and water cooled opposed cylinder aircraft engine |
US20040200665A1 (en) * | 2003-04-08 | 2004-10-14 | Adams Gar M | Exhaust system for V-twin engines |
US20070034175A1 (en) * | 2004-01-02 | 2007-02-15 | Higgins Darrell G | Slide body internal combustion engine |
US7334558B2 (en) | 2004-01-02 | 2008-02-26 | Darrell Grayson Higgins | Slide body internal combustion engine |
US20090007438A1 (en) * | 2006-01-13 | 2009-01-08 | Husqvarna Zenoah Co., Ltd. | Chain Saw |
US20090000130A1 (en) * | 2006-01-13 | 2009-01-01 | Husqvarn Zenoah Co., Ltd. | Chain Saw |
US8210134B2 (en) | 2006-01-13 | 2012-07-03 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US20100083511A1 (en) * | 2008-10-06 | 2010-04-08 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US20100083512A1 (en) * | 2008-10-06 | 2010-04-08 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US8794196B2 (en) | 2008-10-06 | 2014-08-05 | Husqvarna Zenoah Co., Ltd. | Chain saw |
US20100154226A1 (en) * | 2008-12-19 | 2010-06-24 | Andreas Stihl Ag & Co. Kg | Hedge Trimmer |
US8918998B2 (en) * | 2008-12-19 | 2014-12-30 | Andreas Stihl Ag & Co. Kg | Hedge trimmer |
US20110017336A1 (en) * | 2009-07-23 | 2011-01-27 | Briggs & Stratton Corporation | Muffler attachment system |
US8251173B2 (en) | 2009-07-23 | 2012-08-28 | Briggs & Stratton Corporation | Muffler attachment system |
US8413760B2 (en) | 2009-07-23 | 2013-04-09 | Briggs & Stratton Corporation | Muffler attachment system |
CN113503201A (en) * | 2021-07-23 | 2021-10-15 | 浙江派尼尔科技股份有限公司 | Double-cylinder opposed engine silencer |
Also Published As
Publication number | Publication date |
---|---|
JPS6012885Y2 (en) | 1985-04-25 |
DE3151130A1 (en) | 1982-08-05 |
DE3151130C2 (en) | 1986-03-13 |
JPS57109212U (en) | 1982-07-06 |
SE8107158L (en) | 1982-06-26 |
SE453415B (en) | 1988-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KIORITZ CORPORATION, 5-1, SHIMORENJAKU-7-CHOME, MI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:INAGA, HISASHI;FUKUOKA, TAKASHI;REEL/FRAME:003963/0607 Effective date: 19811117 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, PL 96-517 (ORIGINAL EVENT CODE: M170); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19911110 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |